Humic acid-based tobacco fertilizer and preparation method thereof
By preparing humic acid tobacco fertilizer with a magnesium-manganese bimetallic organic framework loaded on a carrier, the problems of soil compaction and nutrient loss were solved, the soil water retention capacity and nutrient absorption efficiency of tobacco were improved, and the quality of tobacco leaves was enhanced.
Patent Information
- Application Number
- CN202511670374.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-01-23
AI Technical Summary
In existing technologies, after tobacco plants have been using chemical fertilizers for a long time, the soil is prone to compaction and nutrient loss, resulting in a decline in the soil's water and fertilizer retention capacity, and poor absorption of trace elements by tobacco plants.
A humic acid-based tobacco fertilizer was developed by preparing a carrier-loaded magnesium-manganese bimetallic organic framework, which, combined with potassium humate and urea, forms a carrier with high specific surface area and high porosity. This carrier adsorbs and fixes soil moisture and inorganic salt ions, slows down the urea release rate, and promotes the absorption of trace elements by tobacco.
It improves the soil's water retention capacity and fertility, prevents nutrient loss, promotes the activity of enzymes and microorganisms in tobacco roots, increases the accumulation of nitrogen and potassium in tobacco, and improves the quality of tobacco leaves.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the tobacco fertilizer technical field, specifically a kind of tobacco fertilizer based on humic acid and preparation method thereof. BACKGROUND
[0002] Humic acid is a kind of high molecular organic compound obtained by decomposition and transformation of animal and plant residues under the action of microorganisms, which needs a long time to form in natural environment, and has positive effects on soil and tobacco plants.
[0003] The application of humic acid in soil promotes the formation of soil aggregate structure, reduces soil bulk density, makes soil more loose, improves the water-retaining, fertilizer-retaining capacity and air permeability of soil, and solves the problem of soil hardening caused by long-term use of chemical fertilizers.
[0004] During plant growth, humic acid can chelate with elements such as nitrogen, phosphorus, potassium, magnesium and manganese required for tobacco growth, preventing nutrient loss and promoting the absorption of trace elements by tobacco, and further stimulating root enzyme and microbial activity through biological stimulation to promote root absorption.
[0005] To solve the above problems, the present application provides a kind of tobacco fertilizer based on humic acid and preparation method thereof. SUMMARY
[0006] The present application aims to provide a kind of tobacco fertilizer based on humic acid and preparation method thereof to solve the problems in the prior art.
[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: Step one: take the carrier and add it to N,N-dimethylformamide, magnetically stir to obtain a carrier mixed solution; take magnesium chloride hexahydrate and manganese chloride tetrahydrate and add them to the carrier mixed solution, magnetically stir, add 1,4-naphthalene dicarboxylic acid, ultrasonic, react, cool, wash, purify, centrifuge, and vacuum dry to obtain a carrier loaded metal organic framework; Step two: take potassium humate and urea and add them to deionized water, mix evenly to obtain a mixed solution; take the carrier loaded metal organic framework and add it to the mixed solution, magnetically stir, centrifuge, wash, and vacuum dry to obtain a tobacco fertilizer.
[0008] More preferably, the preparation method of the carrier is as follows: take pine wood chips, wash, dry, crush, sieve, and obtain pine powder; take humic acid and pine powder, grind, heat at a rate of 9-11 ℃ / min to 590-610 ℃, pyrolyze at a temperature of 590-610 ℃ for 1.5-2.5 h, cool, and grind to obtain the carrier.
[0009] More optimized, the mass ratio of magnesium chloride hexahydrate, manganese chloride tetrahydrate, carrier, N,N-dimethylformamide, 1,4-naphthalene dicarboxylic acid is (0.6-0.7):(0.45-0.55):(0.25-0.35):(28-29):(0.6-0.62).
[0010] More optimized, the preparation method of humic acid is as follows: taking biological waste, washing, drying, crushing, sieving, to obtain biological waste powder; taking biological waste powder, potassium hydroxide, mixing uniformly, adding deionized water, adding catalyst, under the condition of temperature 190-210 DEG C, reaction 22-26h, cooling, centrifugation, using hydrochloric acid to adjust pH value, centrifugation, water washing, drying, to obtain humic acid.
[0011] More optimized, the mass ratio of humic acid and pine powder is (24-26):(0.9-1.1).
[0012] More optimized, the catalyst is any one of ferric hydroxyl oxide and ferric nitrate.
[0013] More optimized, the pH value is adjusted to 1-2.
[0014] Compared with the prior art, the beneficial effects of the present application are: 1, preparation of humic acid, in high temperature and alkaline environment, cellulose, hemicellulose and lignin in biological waste and other macromolecular polymers hydrolysis reaction, form small molecule hydrolysate, under the action of catalyst-ferric hydroxyl oxide, ferric nitrate, small molecule hydrolysate polymerization, form complex structure humic acid; preparation of carrier, under high temperature conditions, humic acid and pine powder co-pyrolysis, humic acid carbonization, heteroatom retention or conversion to form active sites; pine powder pyrolysis, carbonization, accompanied by volatile substances escaping, forming a porous biochar, to obtain the carrier; Ferric hydroxyl oxide as heterogeneous catalyst, on the one hand, easy to separate, on the other hand, trivalent iron ion as lewis acid and hydrogen peroxide produced by biological waste decomposition is reduced to divalent iron ion, divalent iron ion and hydrogen peroxide reaction produces hydroxyl radical with strong oxidizing ability, resulting in cellulose, hemicellulose, lignin and other high molecular polymer in biological waste oxidation, depolymerization, improve the reaction rate, get rich in active functional groups of humic acid; The carrier has high specific surface area and high porosity, and can fix the moisture and inorganic salt ions in the soil through adsorption, so as to inhibit the loss of moisture and nutrients in the soil, improve the water retention capacity and fertility of the soil; the carrier has stable carbon skeleton and surface active site, and can load metal organic framework, so as to inhibit the agglomeration of metal organic framework nanoparticles and provide adsorption platform for humic acid potassium and urea.
[0015] 2. The preparation of the carrier loaded metal organic framework, magnesium ions, manganese ions of magnesium chloride hexahydrate and manganese chloride tetrahydrate as Lewis acid and the carboxyl of 1,4-naphthalene dicarboxylic acid as Lewis base are coordinated by electrostatic interaction to form a magnesium-manganese bimetallic organic framework through self-assembly; and the active sites on the surface of humic acid in the carrier serve as nucleation sites for the growth of magnesium-manganese bimetallic organic framework crystals, inducing the crystallization of magnesium-manganese bimetallic organic framework on the surface of the carrier to obtain a carrier loaded metal organic framework; The magnesium-manganese bimetallic organic framework has high specific surface area and high porosity, and can fix humic acid potassium and urea through adsorption, dissolve urea through water diffusion, delay the release rate of urea, inhibit the loss rate of nutrients, and prevent the occurrence of seedling burning phenomenon; when applied to tobacco fertilizer, it can further fix water and inorganic salt ions in the soil through adsorption, inhibit the loss of water and nutrients in the soil, and improve the water retention capacity and fertility of the soil; On the one hand, the magnesium-manganese bimetallic organic framework slowly decomposes to release trace amounts of magnesium and manganese, which, together with humic acid potassium, serve as magnesium source, manganese source and potassium source to supplement the mineral elements required by plants; on the other hand, tobacco roots secrete acidic substances such as citric acid and malic acid, and the magnesium-manganese bimetallic organic framework is unstable under acidic conditions, so that the magnesium-manganese bimetallic organic framework releases humic acid potassium and urea in the tobacco root system.
[0016] 3. The preparation of tobacco fertilizer, the magnesium-manganese bimetallic organic framework loaded on the carrier has high specific surface area and high porosity, and humic acid potassium and urea diffuse and adsorb into the pores of the magnesium-manganese bimetallic organic framework through concentration gradient at room temperature to obtain tobacco fertilizer; humic acid potassium is hydrolyzed to form humic acid and potassium ions, which, on the one hand, improve the quality of tobacco leaves as potassium source, and on the other hand, chelate trace metal elements through humic acid to prevent nutrient loss and promote the absorption of trace elements by tobacco, and further stimulate root enzyme and microbial activity through biological stimulation to promote root absorption. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0018] The source and model of the substances involved in the present application are not specially limited, and exemplarily include: The item number of magnesium chloride hexahydrate is RQ1367-500g, which is provided by Shanghai Sunny Biological Technology Co., Ltd.; The item number of manganese chloride tetrahydrate is A10069-100g, which is provided by Shandong Xiya Chemical Co., Ltd.; 1,4-naphthalene dicarboxylic acid with the item number S48907-25g is provided by Shanghai Yuan Ye Biotechnology Co., Ltd.; Potassium humate with the item number 0125 is provided by Hubei Qibaier Chemical Co., Ltd.; Urea with the item number S30375-500g is provided by Shanghai Yuan Ye Biotechnology Co., Ltd.; Iron hydroxyl oxide with the item number HBWS-2057 is provided by Hubei Weideli Chemical Reagent Co., Ltd.; Special fertilizer for flue-cured tobacco with the item number YZA-TC25KG is provided by Henan Yuzhongao Agricultural Technology Co., Ltd.
[0019] Example 1: a preparation method of a tobacco fertilizer based on humic acid; Step one: preparation of humic acid Take biological waste, wash, dry, crush, sieve, and obtain biological waste powder; take 3g of biological waste powder, 1.5g of potassium hydroxide, mix uniformly, add 60mL of deionized water, add 0.75g of iron hydroxyl oxide, react at a temperature of 190℃ for 22h, cool, centrifuge at a speed of 8000rpm for 10min, acidify to pH=1 using 2mol / L hydrochloric acid, centrifuge at a speed of 8000rpm for 10min, wash with water, dry, and obtain humic acid; Step two: preparation of carrier Take pine wood chips, wash, dry, crush, sieve, and obtain pine powder; take humic acid and pine powder according to a mass ratio of 24:1.1, grind, heat to 590℃ at a heating rate of 9℃ / min, pyrolyze at a temperature of 590℃ for 1.5h, cool, grind, and obtain the carrier; Step three: preparation of carrier loaded metal organic framework Take 0.5g of the carrier and add it to 60mL of N,N-dimethylformamide, magnetically stir for 30min, and obtain a carrier mixed solution; take 0.6g of magnesium chloride hexahydrate and 0.45g of manganese chloride tetrahydrate, add them to 30mL of the carrier mixed solution, magnetically stir for 30min, add 0.6g of 1,4-naphthalene dicarboxylic acid, ultrasonically treat for 30min, react at a temperature of 120℃ for 18h, cool, wash, purify, centrifuge at a speed of 8000rpm for 5min, and vacuum dry at a temperature of 60℃, and obtain the carrier loaded metal organic framework; Step four: preparation of tobacco fertilizer Take 14g humic acid potassium, 6g urea, add 100mL deionized water, mix evenly, get mixed solution; take 0.9g carrier loaded metal organic framework, add mixed solution, under the condition of temperature 25℃, magnetic stirring 24h, under the condition of rotating speed 8000rpm, centrifugal 5min, washing, under the condition of temperature 60℃, vacuum drying, get tobacco fertilizer.
[0020] Example 2: a preparation method of humic acid based tobacco fertilizer; Step one: preparation of humic acid Take biological waste, wash, dry, crush, sieve, get biological waste powder; take 3g biological waste powder, 2g potassium hydroxide, mix evenly, add 60mL deionized water, add 0.75g iron hydroxyl oxide, under the condition of temperature 200℃, reaction 24h, cooling, under the condition of rotating speed 8000rpm, centrifugal 10min, use 2mol / L hydrochloric acid to acidize to pH=1.5, under the condition of rotating speed 8000rpm, centrifugal 10min, water washing, drying, get humic acid; Step two: preparation of carrier Take pine wood chips, wash, dry, crush, sieve, get pine powder; take humic acid and pine powder according to mass ratio 25:1, grind, according to temperature rising rate 10℃ / min, rise to 600℃, under the condition of temperature 600℃, pyrolysis 2h, cooling, grind, get carrier; Step three: preparation of carrier loaded metal organic framework Take 0.6g carrier, add 60mL N,N-dimethylformamide, magnetic stirring 30min, get carrier mixed solution; take 0.65g magnesium chloride hexahydrate, 0.5g manganese chloride tetrahydrate, add 30mL carrier mixed solution, magnetic stirring 30min, add 0.61g 1,4-naphthalene dicarboxylic acid, ultrasonic 30min, under the condition of temperature 120℃, reaction 18h, cooling, washing, purification, under the condition of rotating speed 8000rpm, centrifugal 5min, under the condition of temperature 60℃, vacuum drying, get carrier loaded metal organic framework; Step four: preparation of tobacco fertilizer Take 15g humic acid potassium, 8g urea, add 100mL deionized water, mix evenly, get mixed solution; take 1g carrier loaded metal organic framework, add mixed solution, under the condition of temperature 25℃, magnetic stirring 24h, under the condition of rotating speed 8000rpm, centrifugal 5min, washing, under the condition of temperature 60℃, vacuum drying, get tobacco fertilizer.
[0021] Example 3: a preparation method of humic acid based tobacco fertilizer; Step one: preparation of humic acid Take the biological waste, wash, dry, crush, sieve, get the biological waste powder; take 3g biological waste powder, 2.5g potassium hydroxide, mix evenly, add 60mL deionized water, add 0.75g iron hydroxyl oxide, under the condition of temperature 210℃, react for 26h, cool, centrifuge under the condition of rotating speed 8000rpm for 10min, acidify to pH=2 using 2mol / L hydrochloric acid, centrifuge under the condition of rotating speed 8000rpm for 10min, wash with water, dry, get humic acid; Step two: preparation of carrier Take pine wood chips, wash, dry, crush, sieve, get pine powder; take humic acid and pine powder according to mass ratio 26:0.9, grind, heat to 610℃ according to heating rate 11℃ / min, pyrolyze under the condition of temperature 610℃ for 2.5h, cool, grind, get carrier; Step three: preparation of carrier loaded metal organic framework Take 0.7g carrier and add to 60mL N,N-dimethylformamide, magnetic stirring for 30min, get carrier mixed solution; take 0.7g magnesium chloride hexahydrate, 0.55g manganese chloride tetrahydrate, add to 30mL carrier mixed solution, magnetic stirring for 30min, add 0.62g 1,4-naphthalene dicarboxylic acid, ultrasonic for 30min, react under the condition of temperature 120℃ for 18h, cool, wash, purify, centrifuge under the condition of rotating speed 8000rpm for 5min, vacuum dry under the condition of temperature 60℃, get carrier loaded metal organic framework; Step four: preparation of tobacco fertilizer Take 16g humic acid potassium, 10g urea, add to 100mL deionized water, mix evenly, get mixed solution; take 1.1g carrier loaded metal organic framework, add to mixed solution, magnetic stirring under the condition of temperature 25℃ for 24h, centrifuge under the condition of rotating speed 8000rpm for 5min, wash, vacuum dry under the condition of temperature 60℃, get tobacco fertilizer.
[0022] Comparative example 1: without adding humic acid, the rest refers to example 2; Step one: preparation of carrier Take pine wood chips, wash, dry, crush, sieve, get pine powder; take pine powder, grind, heat to 600℃ according to heating rate 10℃ / min, pyrolyze under the condition of temperature 600℃ for 2h, cool, grind, get carrier; Step two: preparation of carrier loaded metal organic framework Take 0.6 g of the carrier and add it to 60 mL of N,N-dimethylformamide, and magnetically stir for 30 min to obtain a carrier mixed solution; take 0.65 g of magnesium chloride hexahydrate and 0.5 g of manganese chloride tetrahydrate, and add them to 30 mL of the carrier mixed solution, and magnetically stir for 30 min, add 0.61 g of 1,4-naphthalene dicarboxylic acid, and ultrasonically stir for 30 min, react for 18 h under the condition of a temperature of 120°C, cool, wash, purify, centrifuge for 5 min under the condition of a rotation speed of 8000 rpm, and vacuum dry under the condition of a temperature of 60°C to obtain the carrier loaded metal organic framework; Step three: preparation of tobacco fertilizer Take 15 g of potassium humate and 8 g of urea, add them to 100 mL of deionized water, and mix uniformly to obtain a mixed solution; take 1 g of the carrier loaded metal organic framework, add it to the mixed solution, magnetically stir for 24 h under the condition of a temperature of 25°C, centrifuge for 5 min under the condition of a rotation speed of 8000 rpm, wash, and vacuum dry under the condition of a temperature of 60°C to obtain the tobacco fertilizer.
[0023] Comparative example 2: no addition of iron oxyhydroxide, and the rest refers to example 2; Step one: preparation of humic acid Take biological waste, wash, dry, crush, sieve, and obtain biological waste powder; take 3 g of the biological waste powder and 2 g of potassium hydroxide, mix uniformly, add them to 60 mL of deionized water, react for 24 h under the condition of a temperature of 200°C, cool, centrifuge for 10 min under the condition of a rotation speed of 8000 rpm, acidify to pH=1.5 using 2 mol / L hydrochloric acid, centrifuge for 10 min under the condition of a rotation speed of 8000 rpm, wash with water, and dry to obtain the humic acid; Step two: preparation of carrier Take pine wood chips, wash, dry, crush, sieve, and obtain pine powder; take the humic acid and the pine powder according to a mass ratio of 25:1, grind, and heat to 600°C according to a temperature increasing rate of 10°C / min, pyrolyze for 2 h under the condition of a temperature of 600°C, cool, and grind to obtain the carrier; Step three: preparation of carrier loaded metal organic framework Take 0.6 g of the carrier and add it to 60 mL of N,N-dimethylformamide, and magnetically stir for 30 min to obtain a carrier mixed solution; take 0.65 g of magnesium chloride hexahydrate and 0.5 g of manganese chloride tetrahydrate, and add them to 30 mL of the carrier mixed solution, and magnetically stir for 30 min, add 0.61 g of 1,4-naphthalene dicarboxylic acid, and ultrasonically stir for 30 min, react for 18 h under the condition of a temperature of 120°C, cool, wash, purify, centrifuge for 5 min under the condition of a rotation speed of 8000 rpm, and vacuum dry under the condition of a temperature of 60°C to obtain the carrier loaded metal organic framework; Step four: preparation of tobacco fertilizer Take 15 g of humic acid potassium, 8 g of urea, add to 100 mL of deionized water, mix uniformly to obtain a mixed solution; take 1 g of carrier loaded metal organic framework, add to the mixed solution, under the condition of temperature 25℃, magnetic stirring for 24 h, under the condition of rotating speed 8000 rpm, centrifugal for 5 min, washing, under the condition of temperature 60℃, vacuum drying, to obtain tobacco fertilizer.
[0024] Comparative Example 3: without adding 1,4-naphthalene dicarboxylic acid, the rest is according to Example 2; Step one: preparation of humic acid Take biological waste, wash, dry, crush, sieve to obtain biological waste powder; take 3 g of biological waste powder, 2 g of potassium hydroxide, mix uniformly, add to 60 mL of deionized water, add 0.75 g of iron hydroxyl oxide, under the condition of temperature 200℃, react for 24 h, cool, under the condition of rotating speed 8000 rpm, centrifugal for 10 min, use 2 mol / L hydrochloric acid to acidize to pH=1.5, under the condition of rotating speed 8000 rpm, centrifugal for 10 min, water washing, dry, to obtain humic acid; Step two: preparation of carrier Take pine wood chips, wash, dry, crush, sieve to obtain pine powder; take humic acid and pine powder according to mass ratio 25:1, grind, according to temperature rising rate 10℃ / min, heat to 600℃, under the condition of temperature 600℃, pyrolysis for 2 h, cool, grind, to obtain carrier; Step three: preparation of carrier loaded metal organic framework Take 0.6 g of carrier, add to 60 mL of N,N-dimethylformamide, magnetic stirring for 30 min, to obtain carrier mixed solution; take 0.65 g of magnesium chloride hexahydrate, 0.5 g of manganese chloride tetrahydrate, add to 30 mL of carrier mixed solution, magnetic stirring for 30 min, ultrasonic for 30 min, under the condition of temperature 120℃, react for 18 h, cool, wash, purify, under the condition of rotating speed 8000 rpm, centrifugal for 5 min, under the condition of temperature 60℃, vacuum drying, to obtain carrier loaded metal organic framework; Step four: preparation of tobacco fertilizer Take 15 g of humic acid potassium, 8 g of urea, add to 100 mL of deionized water, mix uniformly to obtain a mixed solution; take 1 g of carrier loaded metal organic framework, add to the mixed solution, under the condition of temperature 25℃, magnetic stirring for 24 h, under the condition of rotating speed 8000 rpm, centrifugal for 5 min, washing, under the condition of temperature 60℃, vacuum drying, to obtain tobacco fertilizer.
[0025] Comparative Example 4: without adding humic acid potassium, the rest is according to Example 2; Step one: preparation of humic acid The biological waste is taken, washed, dried, crushed, sieved to obtain biological waste powder; 3g of the biological waste powder and 2g of potassium hydroxide are uniformly mixed, added into 60mL of deionized water, 0.75g of iron hydroxyl oxide is added, and the mixture is reacted at a temperature of 200℃ for 24h, cooled, centrifuged at a rotation speed of 8000rpm for 10min, acidified to pH=1.5 using 2mol / L hydrochloric acid, centrifuged at a rotation speed of 8000rpm for 10min, washed with water, and dried to obtain humic acid; Step two: preparation of the carrier The pine wood chips are taken, washed, dried, crushed, and sieved to obtain pine powder; the humic acid and the pine powder are taken in a mass ratio of 25:1, ground, and heated to 600℃ at a temperature increasing rate of 10℃ / min, pyrolyzed at a temperature of 600℃ for 2h, cooled, and ground to obtain the carrier; Step three: preparation of the carrier loaded metal organic framework The 0.6g of the carrier is added into 60mL of N,N-dimethylformamide, magnetically stirred for 30min to obtain a carrier mixed solution; 0.65g of magnesium chloride hexahydrate and 0.5g of manganese chloride tetrahydrate are added into 30mL of the carrier mixed solution, magnetically stirred for 30min, 0.61g of 1,4-naphthalene dicarboxylic acid is added, ultrasonically treated for 30min, reacted at a temperature of 120℃ for 18h, cooled, washed, purified, centrifuged at a rotation speed of 8000rpm for 5min, and vacuum dried at a temperature of 60℃ to obtain the carrier loaded metal organic framework; Step four: preparation of the tobacco fertilizer The 8g of urea is added into 100mL of deionized water, uniformly mixed to obtain a mixed solution; 1g of the carrier loaded metal organic framework is added into the mixed solution, magnetically stirred at a temperature of 25℃ for 24h, centrifuged at a rotation speed of 8000rpm for 5min, washed, and vacuum dried at a temperature of 60℃ to obtain the tobacco fertilizer.
[0026] Experiment: The tobacco fertilizers prepared in Examples 1-3 and Comparative Examples 1-4 and the special tobacco fertilizer are taken, and the tobacco fertilizers are applied at a rate of 730kg / hm 2 The fertilizers are applied, and the base fertilizer is applied once per plant; the tobacco variety is Longjiang 911, uniform seedling raising and transplanting are performed, the planting area is 10m x 5.5m, the plant row spacing is 0.5m x 1.1m, a total of 5 rows, and the planting density is 18180 plants / hm 2 The growth period is 17 weeks, and the plants are topped at 11 weeks; the whole plant is taken, 21 leaves are taken, dried, and a test sample is obtained; 0.2g of the test sample is digested by hydrogen peroxide-sulfuric acid at a temperature of 347℃, and the digestion solution is obtained by constant volume to 100mL; (1) nitrogen accumulation amount determination Take 5 mL of the digestion solution, add 2 mL of 100 g / L sodium tartrate, neutralize with 100 g / L potassium hydroxide solution, add deionized water to 40 mL, add 2.5 mL of Nessler's reagent, add deionized water to 50 mL, stand for 30 min, measure the absorbance value at a wavelength of 420 nm, calculate the nitrogen mass concentration by the standard curve, and further calculate the nitrogen mass percentage; Nitrogen mass percentage = tobacco fertilizer nitrogen mass percentage - special tobacco fertilizer nitrogen mass percentage (2) Potassium accumulation amount determination Cancel the digestion solution, measure the intensity of the emitted light by a flame photometer, calculate the potassium mass concentration by the standard curve, and further calculate the potassium mass percentage; Potassium mass percentage = tobacco fertilizer potassium mass percentage - special tobacco fertilizer potassium mass percentage After completing the above experiments, the data obtained are shown in Table 1 below:
[0027] Conclusion: By analyzing the experimental data above, the tobacco fertilizer prepared in Examples 1-3 has a higher nitrogen mass percentage and potassium mass percentage in the tobacco plant compared to the special tobacco fertilizer, indicating that the nitrogen absorption and accumulation amount of the tobacco plant is higher, and the fertilization effect is significant. The tobacco fertilizer prepared in Comparative Examples 1-4 has a lower nitrogen mass percentage and potassium mass percentage in the tobacco plant compared to the special tobacco fertilizer, indicating that the nitrogen absorption and accumulation amount of the tobacco plant is lower, and the fertilization effect is poorer.
[0028] Comparative analysis of Comparative Example 1 without adding humic acid and Example 2 shows that, on the one hand, humic acid provides a surface active site, a nucleation site for the growth of magnesium-manganese bimetallic organic framework crystals, induces the crystallization of magnesium-manganese bimetallic organic framework on the surface of the carrier, and provides an adsorption platform for potassium humate and urea; on the other hand, part of the humic acid is carbonized and is part of the carrier, which fixes water and inorganic salt ions in the soil through adsorption, inhibits the loss of water and nutrients in the soil, and improves the water retention capacity and fertility of the soil.
[0029] Comparative analysis of Comparative Example 2 without adding hydroxyl ferric oxide and Example 2 shows that hydroxyl ferric oxide acts as a heterogeneous catalyst, on the one hand, it is easy to separate, on the other hand, trivalent iron ions reduce hydrogen peroxide produced by the decomposition of biological waste to divalent iron ions, and divalent iron ions and hydrogen peroxide react to produce hydroxyl radicals with strong oxidizing ability, which oxidize and depolymerize cellulose, hemicellulose, lignin and other high molecular polymers in biological waste, improve the reaction rate, and obtain humic acid rich in active functional groups.
[0030] Comparative analysis of Comparative Example 3 without adding 1,4-naphthalene dicarboxylic acid with Example 2 can obtain that the magnesium ion and manganese ion of magnesium chloride hexahydrate and manganese chloride tetrahydrate act as Lewis acid and the carboxyl of 1,4-naphthalene dicarboxylic acid acts as Lewis base to coordinate through electrostatic interaction to form a magnesium-manganese bimetallic organic framework; and the active sites on the surface of the humic acid in the carrier act as nucleation sites for the crystal growth of the magnesium-manganese bimetallic organic framework, inducing the magnesium-manganese bimetallic organic framework to crystallize on the surface of the carrier to obtain a carrier loaded metal organic framework; The magnesium-manganese bimetallic organic framework has high specific surface area and high porosity, and can fix humic acid potassium and urea through adsorption, diffuse water to dissolve urea, delay the release rate of urea, inhibit the loss rate of nutrients, and prevent the occurrence of seedling burning phenomenon; when applied to tobacco fertilizer, the magnesium-manganese bimetallic organic framework can further fix water and inorganic salt ions in the soil through adsorption, inhibit the loss of water and nutrients in the soil, and improve the water retention capacity and fertility of the soil; On the one hand, the magnesium-manganese bimetallic organic framework slowly decomposes to release trace amounts of magnesium and manganese, which, together with humic acid potassium, act as magnesium source, manganese source and potassium source to supplement the mineral elements required by plants; on the other hand, tobacco roots secrete acidic substances such as citric acid and malic acid, and the magnesium-manganese bimetallic organic framework is unstable under acidic conditions, so that the magnesium-manganese bimetallic organic framework releases humic acid potassium and urea in the tobacco root system.
[0031] Comparative analysis of Comparative Example 4 without adding humic acid potassium with Example 2 can obtain that, on the one hand, humic acid potassium acts as a potassium source to improve the quality of tobacco leaves; on the other hand, humic acid chelates trace metal elements to promote the absorption of trace elements by tobacco, and further stimulates root enzyme and microbial activity through biological stimulation to promote root absorption.
[0032] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the application is defined by the appended claims rather than the foregoing description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims.
Claims
1. A method for the preparation of a humic acid based tobacco fertilizer, characterized by: The method comprises the following steps: Step one: take the carrier and add it into N,N-dimethylformamide, and magnetically stir to obtain a carrier mixed solution; take magnesium chloride hexahydrate and manganese chloride tetrahydrate, and add them into the carrier mixed solution, and magnetically stir; then add 1,4-naphthalene dicarboxylic acid, and ultrasonically react, cool, wash, purify, centrifuge, and vacuum dry to obtain a carrier loaded metal organic framework; Step two: take potassium humate and urea, and add them into deionized water, and mix uniformly to obtain a mixed solution; take the carrier loaded metal organic framework, and add it into the mixed solution, and magnetically stir, centrifuge, wash, and vacuum dry to obtain a tobacco fertilizer.
2. A process for the preparation of a humic acid based tobacco fertilizer as claimed in claim 1, wherein: The carrier is prepared by taking pine wood chips, washing, drying, crushing, sieving, and obtaining pine powder; taking humic acid and the pine powder, grinding, heating at a heating rate of 9-11℃ / min to 590-610℃, pyrolyzing at the temperature of 590-610℃ for 1.5-2.5h, cooling, and grinding to obtain the carrier.
3. A process for the preparation of a humic acid based tobacco fertilizer as claimed in claim 1, wherein: The mass ratio of the magnesium chloride hexahydrate, the manganese chloride tetrahydrate, the carrier, the N,N-dimethylformamide, and the 1,4-naphthalene dicarboxylic acid is (0.6-0.7):(0.45-0.55):(0.25-0.35):(28-29):(0.6-0.62).
4. A process for the preparation of a humic acid based tobacco fertilizer as claimed in claim 2, wherein: The humic acid is prepared by taking biological waste, washing, drying, crushing, sieving, and obtaining biological waste powder; taking the biological waste powder and potassium hydroxide, mixing uniformly, adding into deionized water, adding a catalyst, reacting at a temperature of 190-210℃ for 22-26h, cooling, centrifuging, adjusting the pH value by using hydrochloric acid, centrifuging, washing with water, and drying to obtain the humic acid.
5. A process for the preparation of a humic acid based tobacco fertilizer as claimed in claim 2, wherein: The mass ratio of the humic acid and the pine powder is (24-26):(0.9-1.1).
6. A process for the preparation of a humic acid based tobacco fertilizer as claimed in claim 4, wherein: The catalyst is any one of hydroxyl ferric oxide and ferric nitrate.
7. A process for the preparation of a humic acid based tobacco fertilizer as claimed in claim 4, wherein: The pH value is adjusted to 1-2. 8.A humic acid-based tobacco fertilizer prepared by the preparation method of the humic acid-based tobacco fertilizer according to any one of claims 1-7.